That said, I think people need to recognize that in many aspects what's happening is connected to societal issues that gun control and gun regulations will have very little impact on - remember, even in Japan somebody could make some kind of battery ignited home-made shotgun and kill Shinzo Abe.
Countries with strict gun control enjoy far lower rates of firearm accidents, suicides, and murders. IMO it's clearly worth the tradeoff. Very few of us live in a place where only guns can solve our problems.
The fact that occasionally someone goes to great lengths to kill doesn't mean we should make it easier for everyone.
So let’s define what your definition of strict gun control is. Also, if you want people to care more, stop including suicides because it drastically changes the numbers.
The purpose of my original comment was that the US dwindles Japan in firearms, but Japanese still manage to kill themselves just fine. So it's not a strong point by the parent I responded to. If Japan maintained that decrease for several more years, I think this would be worth revisiting, but for now it doesn't have much weight.
Note that Montana, the worst state for suicide, is about the same as South Korea at 28/100k.
I say this sadly as having had a friend kill herself in High School via a gun her dad had lying around. And ya, it was a red state (Mississippi).